/*
 * @(#)StringPipe.java	1.0 Mar 8, 2008
 *
 *	The MIT License
 *
 *	Copyright (c) 2008 Malachi de AElfweald <malachid@gmail.com>
 *
 *	Permission is hereby granted, free of charge, to any person obtaining a copy
 *	of this software and associated documentation files (the "Software"), to deal
 *	in the Software without restriction, including without limitation the rights
 *	to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 *	copies of the Software, and to permit persons to whom the Software is
 *	furnished to do so, subject to the following conditions:
 *
 *	The above copyright notice and this permission notice shall be included in
 *	all copies or substantial portions of the Software.
 *
 *	THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 *	IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 *	FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 *	AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 *	LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 *	OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 *	THE SOFTWARE.
 */
package org.eoti.io.pipe;

import java.nio.charset.Charset;
import java.nio.charset.CharsetEncoder;
import java.nio.charset.CharsetDecoder;
import java.nio.charset.CharacterCodingException;
import java.nio.CharBuffer;
import java.nio.ByteBuffer;
import java.io.IOException;

public class StringPipe
{
	protected FullPipe pipe;
	protected Charset charset;
	protected CharsetEncoder encoder;
	protected CharsetDecoder decoder;

	public StringPipe(Charset charset)
	throws IOException
	{
		pipe = new FullPipe();
		this.charset = charset;
		encoder = charset.newEncoder();
		decoder = charset.newDecoder();
	}

	public void write(String data)
	throws CharacterCodingException, IOException
	{
		CharBuffer chars = CharBuffer.allocate(data.length());
		chars.put(data);
		chars.flip();
		pipe.write(new ByteBuffer[]{encoder.encode(chars)});
	}

	public String read(int reqLength)
			throws CharacterCodingException, IOException
	{
		ByteBuffer buf = ByteBuffer.allocate(reqLength);
		int length = (int)pipe.read(new ByteBuffer[]{buf});
		buf.rewind();
		CharBuffer chars = decoder.decode(buf);
		return chars.subSequence(0, length).toString();
	}
}
